It is a happy number.
It is a plaindrome in base 15.
It is a zygodrome in base 2.
It is a congruent number.
It is an unprimeable number.
212312 is an apocalyptic number.
12312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 12312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18150).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
12312 is a wasteful number, since it uses less digits than its factorization.
12312 is an evil number, because the sum of its binary digits is even.
The square root of 12312 is about 110.9594520534. The cubic root of 12312 is about 23.0910067877.
Adding to 12312 its reverse (21321), we get a palindrome (33633).
Subtracting 12312 from its reverse (21321), we obtain a palindrome (9009).
The spelling of 12312 in words is "twelve thousand, three hundred twelve", and thus it is an iban number.